What’s the Difference Between Selenium 3 and Selenium 4?

Selenium is always considered when it comes to Quality Testing. Today we’ll be discussing the differences between Selenium 3 & Selenium 4. Selenium testing can also be used in the industry.

Businesses need to launch their online products immediately in order to survive in this fast-growing era. There are many automation frameworks on the market, and the Selenium framework is just one of them.

Selenium 1 (Selenium RC), Selenium 2 (Selenium 3), and Selenium 4(Beta) have all been released. Each one will improve your testing abilities.

We are a trusted and reliable QA company in India and we have a blog that explains the difference between Selenium 3 & Selenium 4. We also offer Selenium testing services both in India and abroad.

What is Selenium Automation Testing?

Software development is a key part of product launch. Selenium Automation Testing can be used to test UI automation.

Open-source makes Selenium a unique choice in the QA industry. Selenium testing’s dynamic features make QA quick and easy. We all have limited time and need something that is faster than Selenium.

With the introduction of Agile and DevOps methodologies, Software Automation Testing has already reached new heights.

Selenium 3’s architecture

We must be able to understand both the architecture and function of Selenium 3. This helps us analyze the differences and their work flow. We have also discussed the new concepts of Selenium4 in our blog. Make sure to read it.

Selenium 3 architecture is built on the JSON Wire Protocol. JSON means JavaScript Object Notation. JSON Wire Protocol’s purpose is to facilitate information transfer between Clients and Servers via HTTP (Hypertext Trans Protocol).

Let’s look at the information transfer process between Client and Server using Selenium 3. A Selenium Client sends an HTTP request for selenium. JSON Wire Protocol then receives the request via HTTP. The request is secured by the Browser Driver. The “Server” sends the “Response”, and the “Client’ receives the same.

This is the working model for Selenium 3 and Selenium 4. Selenium 4 doesn’t have JSON Wire Protocol, which is the main difference between the two based on their architecture.

Architecture of Selenium 4

Selenium 4 doesn’t have JSON Wire Protocol, as there is no direct transfer of information between client and server. Selenium Client and WebDriver Language Bindings are the two main elements of Selenium 4. The browser drivers are the server.

Are you familiar with WebDriver Language Bindings? It’s a code library specifically designed to execute the actions that are generated.

Let’s look at the architecture of Selenium 4. The request is sent to the Selenium client in the form of a command. The Browser Drivers receive the request. Once an Automation script is run on the Web Browser, it generates responses.

Selenium 4’s major components, i.e. Selenium Client and WebDriver Language Bindings each have their own language with distinct bindings. These bindings indicate that both elements can access the command/request in their respective languages.

It is easy to understand by using an example. Let’s say the command is in Python. It can be interpreted in Java or C#, Ruby On Rails and other languages. Testing in Selenium 4 is preferred because there is no programming language dependence between bindings.

Having seen their architecture approach, you will now understand how Selenium 4 differs from Selenium 3. You can also contact us if you need Selenium testers to hire in India. We are available to assist you in any way we can.

What is the difference between Selenium 3 and Selenium 4.

In the previous section, we have examined the architectural differences between Selenium 3 & Selenium 4. Let’s now look at their concrete differences to see how they differ from each other.

Knowing them all will help you to understand their proper implementation.


The extension of Chrome Driver will make the first difference between Selenium 3 and 4. The Remote Web Driver in Selenium 3 is now Chrome Driver.

Selenium 4’s Chrome Driver Class extends to Chrome Driver. The Chrome Driver provides predefined methods for using the development tools.

Mode of communication between client and server

We have seen that Selenium 3 and 4 use the JSON Wire Protocol, which allows information to be shared between Clients and Servers.

Selenium 4 uses WebDriver W3C protocol to establish communication between Client and Server.

Start of Hub & Node Jars

Selenium 3 requires that testers start the Hub & Node jars every time they want to perform automation testing. Sometimes, it can be difficult for testers.

Selenium 4 testers can eliminate such problems because they don’t need to open the Hub and Jar to execute Automation Testing.

Last Thoughts

Selenium 3 is different from Selenium 4! You can also read our blogs if you want to learn more about Selenium Testing. We are a trusted software testing company and we strive to keep you informed about any changes in the QA process.

We have a team that is experts in testing and will execute it keeping your requirements in mind. We deliver projects on-time and meet all your expectations. Hire the best testers in India only from Richmonddioceseirp.

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